Thermoluminescence kinetic analysis of basaltic rocks using a generalized model for exponential distribution of activation energies

A new general order Thermoluminescence (TL) model for exponential distribution of activation energies has been presented. In the proposed model an effective kinetic-order has been introduced as an additional adjustable parameter. This makes it possible to take the re-trapping into account and would give a better estimate of the activation energy compared with the first order kinetics model. The proposed model has been applied to the basaltic rocks from central zone of Iran. The obtained results show that the proposed model gives a better fit to the experimental peaks compared to the first order model.     

Potential control under thin aqueous layers using a Kelvin Probe

Kelvin Probes can be modified to control as well as monitor potential. The design and operation of two different Kelvin Probe Potentiostats (KPPs) are described in this paper. One approach uses a permanent magnet and double coil to oscillate the needle at a fixed frequency, an AC backing potential, and software analysis and control schemes. This technique can also control the distance between the tip and sample, thereby tracking the topography of the sample. Both KPPs were used to make measurements on Type 304L stainless steel under thin layers of electrolyte. Cathodic polarization curves exhibited a limiting current density associated with oxygen reduction. The limiting current density varied with solution layer thickness over a finite range of thickness. Anodic polarization curves on 304L in a thin layer of chloride solution resulted in pitting corrosion. The breakdown potential did not vary with solution layer thickness. However, the thin layer was observed to increase in volume remarkably during pit growth owing to the absorption of water from the high humidity environment into the layer with ionic strength increased by the pit dissolution. The open circuit potential (OCP) and solution layer thickness were monitored during drying out of a thin electrolyte layer. Pitting corrosion initiated, as indicated by a sharp drop in the OCP, as the solution thinned and increased in concentration.     

配置高压共轨电控喷油系统的锡柴CA6110发动机性能研究

本文采用自行开发的高压共轨电控喷油系统在锡柴CA6110发动机上进行了匹配试验，摸索了电控系统关键参数对发动机性能的影响规律，并给出了详细的结果，通过对发动机进行的负荷特性和外特性对比试验结果表明，高压共轨电控喷油系统在提高发动机经济性和改善排放方面具有巨大潜力。本次试验积极有效的结果为该系统的实用化研究奠定了基础。     

Shock-induced phase transition of oriented pyrolytic graphite to diamond at pressures up to 15 GPa

In studies of shock-induced phase transition of ordered pyrolytic graphite to a diamond-like phase, the lowest transition onset pressure was observed at 19.6 GPa. The phase transition in that case was considered to be martensitic. In the present study ordered pyrolytic graphite with voids between particles was loaded at pressures up to 15 GPa using a planar shock wave propagating along the basal plane of the graphitic crystal structure. As a result, both diamond-like carbon and diamond were observed in the postshock sample. The phase transition of graphite to diamond was assumed to occur by the release of distortional energy stored in the graphite particles, that is, diffusional-controlled reconstructive mechanism, on the basis of the data by high resolution electron microscopy together with electron energy loss spectroscopy.     

Convective drying of wood-waste in air and superheated steam

The convective batch drying of Western Hemlock hog fuel-sized particles in fixed beds under various operating conditions quantiatively established the effect of factors which govern the drying process. A correlation was obtained for the Nusselt number during the heat transfer controlled period. Under specific conditions, the existence of a unified characteristic drying rate curve was confirmed. Drying behaviour as described by the receding plane model provided a mathematical expression for such a curve. The existence of an inversion point temperature was experimentally confirmed.     

20μm高灵敏浸没型碲镉汞红外探测器

报道了一种新型高灵敏浸没型ＨｇＣｄＴｅ红外探测器的研制，获得了Ｄ＾＊＝１．４６×１０＾１１ｃｍＨｚ＾１／２Ｗ＾－１，Ｒ＝６０８Ｖ／Ｗ，λｃ（２０％）－２０μ，灵敏元面积Ａ＝０．１２×０．１２ｍｍ＾２，和有效通光孔径ψ＝６ｍｍ的浸没型器件。     

VXIbus模块仪器在电路印制板故障诊断系统中的应用

本文介绍了一个由VXIbus模块仪器组建的用于电路印制板故障诊断的自动测试系统,具体的讨论了组建中的主控计算机和接口控制器的选择及被测单元与自动测试设备之间通用接口设计等问题。在文章的最后,给出了测试软件设计实例。实际应用表明,VXIbus模块仪器的应用,为电路印制板故障诊断系统提供了优良的测试性能,使系统的实用行、通用性、灵活性及自动化程度得到了明显的提高。     

Hg_（1－x）Cd_xTe的扫描光致发光研究

用傅里叶变换红外扫描光致发光方法研究了Ｈｇ１－ｘＣｄｘＴｅ体单晶样品，该方法可直接得到ＨｇＣｄＴｅ晶片组分的二维平面分布，并可得到辐射复合在复合机制中所占比重的平面分布，以及晶体中非平衡载流子寿命的分布     

应用光度分析法测定铁和渣中的微量镓

用光度分析法测定镓，为适应多种试样的测定，补做了个别条件试验。用该方法测定了铁、渣、浸钒渣等六种不同类型试样中镓的含量，分析其精度精度符合要求。     

施工系统中混凝土拌和工厂位置选择综合评价模型

在大型水利水电工程施工系统中，混凝土拌和工厂位置选择涉及大量不确定性因素，本文用可能性－满意度来描述决策者对不确定性估计的主观性和管观性，论述了可能性与模糊集，满意度与信任度的对应关系，给出了可靠性－满意度的计算方法。以系统分析的层次性原理为基础，建立了厂址选择的综合评价模型，通过一个实例分析，得到几点结论。